A Comparative Study for Calculating the Diameters of the Red and White Muscle Fibers in Luciobarbus Xanthopterus (Heckel,1843) And Leuciscus Vorax (Heckel,1843) In Karbala Governorate.

Abstract

The current study included a study related to the life of fish as a comparative study to choose the best species for fish farming, which is to calculate some of the histological characteristics of skeletal muscles red and white by calculating the diameters of muscle fibers of both types red and white in two different regions of the body (R1 and R2) There are two types of bony river fish in the Shatt al-Hindi waters with different dietary habits, namely : Luciobarbus xanthopterus (Heckel,1843) and Leuciscus vorax (Heckel,1843),which belong to the cyprinidae,The results of the phenotypic histological examination of the muscle tissue showed that the diameters of the red muscle fibers were of small sizes and almost identical in shape where the values of their averages in L . xanthopterus ranged between (42.45 -46.38 micron) while their rates were between (31.24 – 46.41micron) in L. vorax,While the diameters of the white muscle fibers were large and varied and irregular in mosaic shap If the values of the averages of their diameters ranged in L . xanthopterus between (69.77 – 73.87 micron) while their average values were (57.25 – 69.32 micron) in the L. vorax This means a clear difference in the values of the average values of the diameters of red and white muscle fibers in the regions of the body studied (R1, R2) in both types,Meaning that the values of the rates of the diameters of the red and white muscle fibers decrease towards the back (caudal peduncle) for its importance associated with the swimming of both types of fish .